A flat blade turbine agitator with a disk having six blades is installed in a tank. The tank diameter $Dt$ is $1\mathrm{.}83m,$ the turbine diameter $D_2$ is $0\mathrm{.}61m,D_t=H$ and width $W$ is $0\mathrm{.}122m.$ The tank contains four baffles, each having a width $j$ of $0\mathrm{.}15m.$ The turbine is operated at $90rpm$ and the liquid in the tank has a viscosity of $10cp$ and density of $929k\frac{g}{m^3}.$ Predict the time of mixing for the turbine system.